US7151989B2 - Twin-clutch gearbox and method for shifting an initial gear upwards into a target gear in the twin-clutch gearbox of a motor vehicle - Google Patents
Twin-clutch gearbox and method for shifting an initial gear upwards into a target gear in the twin-clutch gearbox of a motor vehicle Download PDFInfo
- Publication number
- US7151989B2 US7151989B2 US10/711,244 US71124404A US7151989B2 US 7151989 B2 US7151989 B2 US 7151989B2 US 71124404 A US71124404 A US 71124404A US 7151989 B2 US7151989 B2 US 7151989B2
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- US
- United States
- Prior art keywords
- motor
- red
- torque
- gear
- clutch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/68—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings
- F16H61/684—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive
- F16H61/688—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive with two inputs, e.g. selection of one of two torque-flow paths by clutches
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- B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
- B60K28/10—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle
- B60K28/16—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle responsive to, or preventing, skidding of wheels
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- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
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- F16H—GEARING
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- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10T74/19—Gearing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
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- Y10T74/19219—Interchangeably locked
- Y10T74/19284—Meshing assisters
- Y10T74/19288—Double clutch and interposed transmission
Definitions
- the present invention relates to a twin-clutch transmission and a method for carrying out an upshift from an initial gear into a target gear in the twin-clutch transmission of a vehicle.
- Twin-clutch transmissions especially parallel shift transmissions, and shifting strategies for these transmission systems are known from vehicle technology. It has been shown that it is possible, especially with parallel shift transmissions, that at the beginning of the shifting an incorrect target gear is engaged on the target shaft. For a successful crossover shift, the target gear must therefore first be changed. In particular with pulling downshifts, this time can be used to accelerate the engine to the target speed. However, in upshifts the vehicle is further accelerated long enough for the target gear to be engaged. In particular when the driver manually triggers the shift command, this can lead to impairments of comfort.
- the object of the invention is therefore to provide a twin-clutch transmission and a method for carrying out upshifting from an initial gear into a target gear in a twin-clutch transmission of a vehicle with which comfortable shifting is realized, especially in the event of incorrectly engaged target gears.
- engine torque M Motor is reduced, for example, at the beginning of a pulling upshift or the like until the target gear is engaged.
- engine torque M Motor can be increased thereafter to a torque desired by the driver M FW so that the shifting is not carried out at too low a torque level.
- an engine torque (M Motor ) may be maximally decreased to a reduced engine torque (M Red ), which preferably may be determined according to the following equation:
- M Red M FW ⁇ ( 1 - i alt - i neu i alt )
- the driver's desired torque is labeled M FW
- the ratio of the initial gear is labeled i alt
- the ratio of the target gear is labeled i neu .
- the maximum engine torque M Red to be reduced when an incorrectly pre-selected target gear is detected may be determined in a first phase. Then a check is made of whether the engine torque M Motor is greater than the maximum engine torque M Red to be reduced. If this is the case, the engine torque, for example, can be decreased in a linear or similar manner to a reduced engine torque M Red until the target gear is engaged. Should the reduced engine torque M Red already be reached, it is possible to wait until the target gear is engaged. After the pre-selection of the target gear, the first phase is terminated. Thereafter, a second phase may follow in which a crossover shift is carried out, it being possible to increase engine torque M Motor to a driver's desired torque M FW .
- a particular advantage of this shifting strategy lies in the fact that in the first stage the vehicle is no longer fully accelerated so that, in particular with full-throttle shifts, the vehicle is prevented from reaching speeds in the range of the engine speed limiter of the internal combustion engine.
- the shifting method presented here may be used in particular with uninterrupted shift transmissions (USG), such as twin-clutch transmissions or parallel shift transmissions.
- USB uninterrupted shift transmissions
- the objective of the present invention may be achieved, on the other hand, via a twin-clutch transmission for a vehicle, especially to carry out the proposed method.
- the twin-clutch transmission of the invention may have at least one device for the detection of an incorrectly pre-selected target gear with which the engine torque M Motor is also changed in such a manner that the output torque M output is reduced if the correct target gear is engaged.
- FIG. 1 shows diagrams with torques and speed curves during a pulling upshift in reference to the method of the invention
- FIG. 2 shows a flow diagram of a first phase of the method of the invention.
- FIG. 3 shows a flow diagram of a second phase of the method of the invention.
- FIG. 1 the curve of output torque M output during a pulling upshift is illustrated in the top diagram. Shown in the center diagram are the curves of the engine speed: speed n_GE 1 of the transmission input shaft assigned to the initial gear and speed n_GE 2 of the transmission input shaft assigned to the target gear. Depicted in the bottom diagram are the curves of engine torque M Motor , of clutch torque M_Kupp 1 on the clutch assigned to the initial gear and of clutch torque M_Kupp 2 on the clutch assigned to the target gear.
- the pulling upshift in this context is divided into a first phase (engagement of the target gear) and a second phase (crossover).
- the decrease of the output torque M output occurs during the first phase on the target gear level. This means that the synchronization of the engine speed to the target gear occurs later than in a shift with a correctly pre-selected target gear. If the engagement of the target gear takes longer than the decrease of engine torque M Motor to reduced engine torque M Red , the target torque M Red may be held long enough for the target gear to be engaged. If the phase is shorter, it is possible to transition directly into the second phase before reaching M Red . In this case, however, there may be a limitation due to the maximum driving speed of the clutches.
- Illustrated in FIG. 2 is a flow diagram of the first phase.
- the maximum engine torque to be reduced M Red is determined. Then a check is made of whether engine torque M Motor is greater than the maximum engine torque M Red to be reduced. If this is the case, engine torque M Motor may be decreased in a linear manner to a reduced engine torque M Red until the target gear is engaged. If the reduced engine torque M Red is reached, the system waits until the target gear is engaged. Should several steps be required in order to reach the reduced engine torque M Red , the described procedure is repeated. After engagement of the target gear, the first phase is terminated.
- FIG. 3 A flow diagram of the second phase is illustrated in FIG. 3 .
- a check is made of whether the engine torque M Motor is smaller than the driver's desired torque M FW . If so, the engine torque M Motor is increased in a linear manner until the driver's desired torque M FW is present. Thereafter, the particular clutch torques M_Kupp 1 and M_Kupp 2 are calculated. This may be repeated until the crossover shift is terminated.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Automation & Control Theory (AREA)
- Electromagnetism (AREA)
- Control Of Transmission Device (AREA)
- Mechanical Operated Clutches (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
- Hybrid Electric Vehicles (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Structure Of Transmissions (AREA)
Abstract
Description
Claims (15)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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DE10209917.0 | 2002-03-07 | ||
DE10209917 | 2002-03-07 | ||
PCT/DE2003/000647 WO2003074313A2 (en) | 2002-03-07 | 2003-02-28 | Twin-clutch gearbox and method for shifting an initial gear upwards into a target gear in the twin-clutch gearbox of a motor vehicle |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/769,064 Division US7862233B2 (en) | 2004-09-02 | 2007-06-27 | Self heating monitor for SiGe and SOI CMOS devices |
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US10/711,225 Expired - Fee Related US7044280B2 (en) | 2002-03-07 | 2004-09-02 | Method for adapting the clutch characteristics in a twin-clutch system |
US10/711,227 Expired - Fee Related US7137310B2 (en) | 2002-03-07 | 2004-09-02 | Twin-clutch transmission and method for carrying out a gearshift in a twin-clutch transmission |
US10/711,245 Expired - Lifetime US7094176B2 (en) | 2002-03-07 | 2004-09-03 | Method for carrying out gear shifting in a twin-clutch gearbox |
US10/711,244 Expired - Fee Related US7151989B2 (en) | 2002-03-07 | 2004-09-03 | Twin-clutch gearbox and method for shifting an initial gear upwards into a target gear in the twin-clutch gearbox of a motor vehicle |
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US10/711,225 Expired - Fee Related US7044280B2 (en) | 2002-03-07 | 2004-09-02 | Method for adapting the clutch characteristics in a twin-clutch system |
US10/711,227 Expired - Fee Related US7137310B2 (en) | 2002-03-07 | 2004-09-02 | Twin-clutch transmission and method for carrying out a gearshift in a twin-clutch transmission |
US10/711,245 Expired - Lifetime US7094176B2 (en) | 2002-03-07 | 2004-09-03 | Method for carrying out gear shifting in a twin-clutch gearbox |
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US (4) | US7044280B2 (en) |
JP (1) | JP4286149B2 (en) |
AT (3) | ATE309923T1 (en) |
DE (4) | DE50306034D1 (en) |
IT (13) | ITMI20030428A1 (en) |
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DE50306034D1 (en) | 2007-02-01 |
DE10390914D2 (en) | 2005-05-19 |
JP2005518982A (en) | 2005-06-30 |
US7137310B2 (en) | 2006-11-21 |
ITMI20030423A1 (en) | 2003-09-08 |
US7094176B2 (en) | 2006-08-22 |
ITMI20030424A1 (en) | 2003-09-08 |
ITMI20030420A1 (en) | 2003-09-08 |
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JP4286149B2 (en) | 2009-06-24 |
ITMI20030429A1 (en) | 2003-09-08 |
US20050061599A1 (en) | 2005-03-24 |
ITMI20030427A1 (en) | 2003-09-08 |
US20050064991A1 (en) | 2005-03-24 |
ITMI20030422A1 (en) | 2003-09-08 |
ITMI20030430A1 (en) | 2003-09-08 |
ITMI20030418A1 (en) | 2003-09-08 |
ITMI20030425A1 (en) | 2003-09-08 |
ATE348970T1 (en) | 2007-01-15 |
DE50301677D1 (en) | 2005-12-22 |
DE10390837D2 (en) | 2005-06-02 |
US20050064987A1 (en) | 2005-03-24 |
ITMI20030421A1 (en) | 2003-09-08 |
ITMI20030419A1 (en) | 2003-09-08 |
US7044280B2 (en) | 2006-05-16 |
ITMI20030428A1 (en) | 2003-09-08 |
ATE309923T1 (en) | 2005-12-15 |
ITMI20030426A1 (en) | 2003-09-08 |
ATE403811T1 (en) | 2008-08-15 |
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